US4239798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion resistant silicone coated polycarbonate article
Assignee: General Electric Co
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Filing: 1978-11-01
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Granted: 1980-12-16
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Expires: 1998-11-01
Abstract
Abstract A process, and the article produced thereby, for providing a uniformly and tenaciously adhered abrasion resistant and chemical resistant non-opaque coating on polycarbonate articles. The process comprises priming the surface of the polycarbonate article with an adhesion promoting thermoplastic acrylic polymer by forming a thin film of said thermoplastic acrylic polymer on the surface of the polycarbonate article, applying a silica filled organopolysiloxane coating composition onto the primed polycarbonate article, and thereafter curing the silica filled organopolysiloxane to form a hard, abrasion and chemical solvent resistant top coat which is tenaciously adhered to the polycarbonate article. The non-opaque coated polycarbonate article produced by this process comprises a polycarbonate substrate having (i) a primer layer comprised of a thermoplastic acrylic polymer, and (ii) a thermoset silica filled organopolysiloxane top coat.
Inventors
- 👤 Siegfried H. Schroeter
- 👤 Daniel R. Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:17
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00865; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/046; C08J2369/00; C08J2433/00; C08J2433/04; C08J2433/06; C08J2483/00; C08J2483/04; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10S428/918; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2951; Y10T428/2955; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
119 words
A shaped non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of a thermoplastic acrylic polymer; and (ii) disposed on said primer layer a durably adhered top coat layer consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said thermoset organopolysiloxane being the condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 .
Claim 2
Dependent Claim
119 words
A shaped non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of a thermoplastic acrylic polymer; and (ii) disposed on said primer layer a durably adhered top coat layer consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said thermoset organopolysiloxane being the condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 .
Claim 3
Dependent Claim
16 words
The article of claim 1 wherein said primer layer contains at least one ultraviolet light absorber.
Claim 4
Dependent Claim
24 words
The article of claim 1 wherein said thermoset colloidal silica filled organopolysiloxane contains from about 10 to about 70 weight percent of colloidal silica.
Claim 5
Dependent Claim
22 words
The article of claim 1 wherein said thermoset colloidal silica filled organopolysiloxane is the condensation product of CH 3 Si(OH) 3 .
Claim 6
Dependent Claim
23 words
The article of claim 4 wherein said thermoset silica filled organopolysiloxane contains from about 10 to about 70 weight percent of colloidal silica.
Claim 7
Dependent Claim
182 words
A non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of a thermoplastic acrylic polymer; and (ii) disposed on said primer layer a durably adhered top coat consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said colloidal silica filled thermoset organopolysiloxane being the cured product of a composition consisting essentially of a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 wherein R is selected from alkyl radicals containing from 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 8
Dependent Claim
182 words
A non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of a thermoplastic acrylic polymer; and (ii) disposed on said primer layer a durably adhered top coat consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said colloidal silica filled thermoset organopolysiloxane being the cured product of a composition consisting essentially of a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 wherein R is selected from alkyl radicals containing from 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 9
Dependent Claim
16 words
The article of claim 6 wherein said primer layer includes at least one ultraviolet light absorber.
Claim 10
Dependent Claim
13 words
The article of claim 6 wherein said thermoplastic acrylic polymer is poly(methyl methacrylate).
Claim 11
Dependent Claim
13 words
The article of claim 6 wherein said thermoplastic acrylic polymer is poly(ethyl acrylate).
Claim 12
Dependent Claim
13 words
The article of claim 6 wherein said thermoplastic acrylic polymer is poly(isobutyl methacrylate).
Claim 13
Dependent Claim
18 words
The article of claim 6 wherein said thermoplastic acrylic polymer has a molecular weight of at least 15,000.
Claim 14
Dependent Claim
21 words
The article of claim 6 wherein said thermoplastic acrylic polymer is a copolymer obtained from the copolymerization of two acrylic monomers.
Claim 15
Dependent Claim
17 words
The article of claim 12 wherein said copolymer is a copolymer of methyl methacrylate and n-butyl methacrylate.
Claim 16
Dependent Claim
161 words
A non-opaque coated polycarbonate article comprising a polycarbonate substrate having on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of a thermoplastic acrylic polymer; and (ii) a top coat composition disposed on said primer layer, said top coat composition consisting essentially of a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 inclusive carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 17
Dependent Claim
161 words
A non-opaque coated polycarbonate article comprising a polycarbonate substrate having on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of a thermoplastic acrylic polymer; and (ii) a top coat composition disposed on said primer layer, said top coat composition consisting essentially of a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 inclusive carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 18
Dependent Claim
16 words
The article of claim 14 wherein said primer layer contains at least one ultraviolet light absorber.
Claim 19
Dependent Claim
128 words
A shaped coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of (A) a thermoplastic acrylic polymer, and (B) at least one ultraviolet light screening compound; and (ii) disposed on said primer layer a durably adhered top coat layer consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said thermoset organopolysiloxane being the condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 .
Claim 20
Dependent Claim
128 words
A shaped coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of (A) a thermoplastic acrylic polymer, and (B) at least one ultraviolet light screening compound; and (ii) disposed on said primer layer a durably adhered top coat layer consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said thermoset organopolysiloxane being the condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 .
Claim 21
Dependent Claim
24 words
The article of claim 16 wherein said colloidal silica filled thermoset organopolysiloxane contains from about 10 to about 70 weight percent of colloidal silica.
Claim 22
Dependent Claim
21 words
The article of claim 16 wherein said colloidal silica filled thermoset organopolysiloxane is the condensate of CH 3 Si(OH) 3 .
Claim 23
Dependent Claim
24 words
The article of claim 18 wherein said colloidal silica filled thermoset organopolysiloxane contains from about 10 to about 70 weight percent of colloidal silica.
Claim 24
Dependent Claim
188 words
A coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on at least one surface thereof (i) a primer layer consisting essentially of (A) a thermoplastic acrylic polymer, and (B) at least one ultraviolet light screening compound; and (ii) disposed on said primer layer a durably adhered top coat consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said colloidal silica filled thermoset organopolysiloxane being the cured product of a composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 wherein R is selected from alkyl radicals containing from 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 25
Dependent Claim
188 words
A coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on at least one surface thereof (i) a primer layer consisting essentially of (A) a thermoplastic acrylic polymer, and (B) at least one ultraviolet light screening compound; and (ii) disposed on said primer layer a durably adhered top coat consisting essentially of a colloidal silica filled thermoset organopolysiloxane, said colloidal silica filled thermoset organopolysiloxane being the cured product of a composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 wherein R is selected from alkyl radicals containing from 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 26
Dependent Claim
26 words
The article of claim 20 wherein said thermoplastic acrylic polymer is the polymerization product of at least one monomer selected from acrylate monomers and methacrylate monomers.
Claim 27
Dependent Claim
18 words
The article of claim 21 wherein said thermoplastic acrylic polymer is the polymerization product of an acrylate monomer.
Claim 28
Dependent Claim
18 words
The article of claim 21 wherein said thermoplastic acrylic polymer is the polymerization product of a methacrylate monomer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |